@SureKT : Effectively , even on iPhone (using Chrome), the Submit button is unreachable in Portrait mode (in Mobile and Desktop view) and barely visible on Landscape…
… and I don’t see what you could personally do about it, except, if it’s not done already, contact support through Intercom (using the big question mark ? which should be at the bottom right of your screen when logged in Coda ) and let them know about it !